Influence of recycled coarse aggregates on normal and high performance concrete subjected to elevated temperatures

Cléo Laneyrie (1) , Anne-Lise Beaucour (1) , Mark Green (2) , Ronan Hébert (3) , Béatrice Ledesert (4) , Albert Noumowe (1)

1 L2MGC - Laboratoire de mécanique et matériaux du génie civil
2 CERV - Centre Européen de Réalité Virtuelle
3 LT - Laboratoire de tectonique
4 GEC - Laboratoire Géosciences et Environnement Cergy

Recycled concrete aggregates (RCA) can be a promising solution for sustainable development. For buildings, the high temperature performance is critical to estimate fire resistance. Thus, this paper investigates RCA concretes after exposure to temperatures up to 750 °C by considering laboratory and industrial RCA, and normal and high performance concretes. Tests were conducted on cylindrical specimens to assess cracking, mass loss, porosity, and thermal and mechanical properties. The residual performances for the recycled concretes were generally similar to but slightly worse than those observed for the reference concretes. The presence of non-cementitious impurities accelerates the damage of concretes with temperature.

Mots clés: Recycled concrete aggregatesHigh temperatureFireCracking patternThermal conductivityDynamic modulusMechanical strengthPorosity; Recycled concrete aggregatesHigh temperatureFireCracking patternThermal conductivityDynamic modulusMechanical strengthPorosity

Domaines: Sciences de l'ingénieur [physics]

Cléo Laneyrie, Anne-Lise Beaucour, Mark Green, Ronan Hébert, Béatrice Ledesert, et al.. Influence of recycled coarse aggregates on normal and high performance concrete subjected to elevated temperatures. Construction and Building Materials, 2016, 111, pp.368-378. ⟨10.1016/j.conbuildmat.2016.02.056⟩. ⟨hal-03988346⟩